(() => {
  const redirectPath = '/go/';
  const urlParams = new URLSearchParams(window.location.search);

  if (window.location.pathname === redirectPath || window.location.pathname === '/go') return;
  if (urlParams.get('noExternalRedirect') === '1') return;

  function getExternalUrl(anchor) {
    const href = anchor.getAttribute('href');
    if (!href || href.startsWith('#')) return null;

    let targetUrl;
    try {
      targetUrl = new URL(href, window.location.href);
    } catch {
      return null;
    }

    if (!['http:', 'https:'].includes(targetUrl.protocol)) return null;
    if (targetUrl.origin === window.location.origin) return null;

    return targetUrl.href;
  }

  document.addEventListener('click', (event) => {
    const anchor = event.target.closest?.('a[href]');
    if (!anchor) return;
    if (event.defaultPrevented || event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) return;

    const externalUrl = getExternalUrl(anchor);
    if (!externalUrl) return;

    event.preventDefault();

    const redirectUrl = `${redirectPath}?url=${encodeURIComponent(externalUrl)}&from=${encodeURIComponent(window.location.href)}`;
    const target = anchor.getAttribute('target');

    if (target && target !== '_self') {
      window.open(redirectUrl, target, 'noopener,noreferrer');
      return;
    }

    window.location.href = redirectUrl;
  });
})();